We found a further small issue in review and I fixed it up.
Thanks Robie for spotting them!

Test:
In normal/default environments after an upgrade:

$ find /var/run/qemu/; findmnt -T /var/run/qemu
/var/run/qemu/
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-ssh.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-rbd.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-iscsi.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-curl.so
/var/run/qemu/README
TARGET    SOURCE FSTYPE OPTIONS
/run/qemu none   tmpfs  rw,nosuid,nodev,relatime,mode=755,inode64

In an environment where exec in /var/run/qemu works after an upgrade it:

$ sudo mount -o remount,exec /run
$ findmnt -T /var/run
TARGET SOURCE FSTYPE OPTIONS
/run   tmpfs  tmpfs  rw,nosuid,nodev,relatime,size=202588k,mode=755,inode64

Then upgrade

$ find /var/run/qemu/; findmnt -T /var/run/qemu
/var/run/qemu/
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-ssh.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-rbd.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-iscsi.so
/var/run/qemu/Debian_1_5.2+dfsg-9ubuntu3.2~hirsuteppa7/block-curl.so
/var/run/qemu/README
/var/run/qemu/exec
TARGET SOURCE FSTYPE OPTIONS
/run   tmpfs  tmpfs  rw,nosuid,nodev,relatime,size=202588k,mode=755,inode64


All other things e.g. no mount stacking are still valid.

---

To sum this up: New builds in the PPA tested fine and I uploaded to
-unapproved (again).

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https://bugs.launchpad.net/bugs/1913421

Title:
  Load of pre-upgrade qemu modules needs to avoid noexec

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